screen refresh rate is very low about lvgl HOT 5 CLOSED

Some questions:

• What is LV_MEM_SIZE set to? (for the freeze at the end)
• What is the clock speed of that MCU? STM32 MCUs start up with a clock speed lower than their max capability. Modify the relevant hardware registers to increase the clock speed.
• Can you change the optimization flags of your build?

from lvgl.

Dispite deactivating Call of lv_tick_inc(10) in interrupt and followed main loop:

while (1)
  {
		lv_timer_handler();
		lv_tick_inc(HAL_GetTick() - lv_tick_get());
  }

the refresh rate of screen is very low like in the video in next post from me

from lvgl.

Thanks for questions,

• LV_MEM_SIZE is set now 128 * 1024U. with that setting the keybord is working
• Regarding MCU Clock I have tested with Switching SysClk and PLLCLK to external pin via Master Clock Output. Both measured values runs at 200MHz
• I have played with optimisation flags but I have now flashing screen with pulsed widget output (pulses can not be shown in video) with shadowed artefacts.

That can be done in order to eliminate this shadows and pulsed widget output? I have followed setting in lv_conf.h:

/*Default display refresh, input device read and animation step period.*/
#define LV_DEF_REFR_PERIOD  20     /*[ms]*/
#define LV_DPI_DEF 128     /*[px/inch]*/ // the display pixel is 0.198mm (Width/Hight)

and in main loop:

while (1)
{
		lv_timer_handler();
		lv_tick_inc(HAL_GetTick() - lv_tick_get());
		HAL_Delay(20); // SysTick in ms
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
}
```

from lvgl.

I have activated system monitor with this in lv_conf.h:

/*1: Enable system monitor component*/
#define LV_USE_SYSMON   1
#if LV_USE_SYSMON
    /*Get the idle percentage. E.g. uint32_t my_get_idle(void);*/
    #define LV_SYSMON_GET_IDLE lv_timer_get_idle

    /*1: Show CPU usage and FPS count
     * Requires `LV_USE_SYSMON = 1`*/
    #define LV_USE_PERF_MONITOR 1
    #if LV_USE_PERF_MONITOR
        #define LV_USE_PERF_MONITOR_POS LV_ALIGN_BOTTOM_RIGHT

        /*0: Displays performance data on the screen, 1: Prints performance data using log.*/
        #define LV_USE_PERF_MONITOR_LOG_MODE 0
    #endif

    /*1: Show the used memory and the memory fragmentation
     * Requires `LV_USE_STDLIB_MALLOC = LV_STDLIB_BUILTIN`
     * Requires `LV_USE_SYSMON = 1`*/
    #define LV_USE_MEM_MONITOR 1
    #if LV_USE_MEM_MONITOR
        #define LV_USE_MEM_MONITOR_POS LV_ALIGN_BOTTOM_LEFT
    #endif

#endif /*LV_USE_SYSMON*/

Now I see that CPU stabil at 0% FPS is not 50 but remains 33 even if LV_DEF_REFR_PERIOD=10.
Memory Usage 26% and 2 % frag. (can that Fragmentation be complett disabled?)

from lvgl.

Okay the Problem with Refresh rate is eliminated. It was the settings from LTDC, which has that bahavior. The settings from datasheet of display were wrong interprated.

from lvgl.